Hi again,
quick question:
Is it at all possible to extend a protocol to a particular primitive
array type but also handle nesting of arrays? A double[] is not the same
class as double[][] which in turn is not the same Class as double[][][]
etc etc and there is no interface tying them together.... So this means
I can't do the regular trick that I can do with any other Collection type.
example:
(defprotocol Normalisable
(normalise [this transformer]))
(extend-protocol Normalisable
Number
(normalise [this transform]
(transform this))
String
(normalise [this stem]
(stem this))
java.util.List ;;if this fires, we're dealing with a Java list-like
collection - return a vector
(normalise [this transform]
(if (instance? java.util.Collection (first this)) ;;handle nesting at
the top interface and pray that an extension-point for that type exists
(mapv #(normalise % transform) this)
(let [top (delay (apply max this))
bottom (delay (apply min this))]
(mapv (fn [x] (normalise x #(transform % [top bottom]))) this))) )
and so forth for Collections... for arrays it's the same story (but with
amap) but it will only work for 1d arrays. Extending to object-arrays,
thinking that the outer array is an Object[], fails miserably. How on
earth am I supposed to handle nesting in a general way?
thanks in advance...
Jim
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